Fix DocC warnings and errors, including those from SPI #836
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This includes a variety of cleanups and fixes to resolve DocC warnings and errors, including those which show up only when you manually include SPI declarations (by passing the
-include-spi-symbols
Swift compiler flag).I extracted some of these from #295, and found new ones. I still plan to pursue that PR, but reduce its focus to just enabling the SPI documentation flag in some local development workflows. In the mean time, this PR contains only documentation fixes.
Checklist: